Planoqraph co



H. l. FRINK.

WOOD PULP GRIND-E 8 APPLICATION FILED APR. 26. 1919-.

Patented July 22, 1919.

2 SHEETS-SHEET 1.

H. J. FRINK.

WOOD PULP GRINDER. APPLICATION FILED APR. 26. 1919.

V Patented July 22, 1919.

2 SHEETS-SHEET 2.

HERBERT J. FRINK, 0F. HoLY0KE,: iusssnornisrirrs, in'ssfenon. ro-n'onyoxnnisonmn COMPANY, OF HOLY;OKE, MASSACHUSETTS:AgQORPO' TI01\T.OF;MASSACHUSETTS To all whom it may concern:

Be it known that I, HERBERT J. FRINK, a} citizen of the United'States of America,re siding at Holyoke, in the county of Hampden and State of Massachusetts, have 'in-" vented certain-new and useful Improve ments in \Vood-Pulp Grinders, of which the following is a specification; This invention relates to improvements in wood pulp grinders and more particularly to improvements in the means employed for forcing the wood against the grindstone.

' Originally, grinders} of"' tl1 iscl'1aracter were provided with wood pockets, which were designed to take shortlengths of=woodi With such short lengths of wood, 'therefwas seldom any material variation indiame'ter' throughout the l hg h of the 'wo'odu More" recently, however,*a demandhas arisen forgrinders having wood pockets which are capable of receiving wood of relatively longlength and the obstacle to usin such long lengths of wood is the appreciable and very material variation, which exists betweenone end of the woodand the other. Obviously, with the ordinary grinder, the wood, when of variable diameter throughout its length,

will not be forced against'the grindstone with uniform pressure.

That the difiiculty mentioned constitutes a real problem in the development of grinders for the production of wood pulp is evidenced by the prior art, wherein it has been proposed to provide with each single wood box two or more pressure devices, each acting inde endently of the other to force the wood against the grindstone with uniform pressure despite material variations of diameter from end to end in the wood.

This invention is concerned with another and improved solution for the stated problem and, more particularly with the provision of means for overcoming the prior difficulties in a much less expensive manner.

According to my invention, I provide, in connection with each wood box and its pressure device, a follower which is connected to the pressure device for limited swinging movement and which may, therefore, conform to the taper of the wood engaged by it in the wood box.

Other features and advantages will appear in the following description and in the illustrative embodiment of the invention in the accompanying drawings, in which SpecificationqfIiettersiPatent. i, {wanted July'22; 1919. v "resumesm le-2g,1 1 stream "Referring "these 'drawings, there is shown, '1 and ,2 and 'in conventional formfsu'ch elements of a wood'pul'p grinder as are necessary to an understanding'of the invention. IX-[represents the frame of the machineg the grindstone rotatabl y mounted therein? "Adjacent the periphery of stone 9 'afre o nepr more wood pockets at (as illustr atd,-three in number) and as'soc'iated with'f'each pocket w is a pressure devicefwliichconsist's of a cylinder 0, a piston p'f'and piston rod] 1'. Associated with the piston rod 1' is a follower j, which directly engages the wood 00 and forces it against the periphery of the grindstone g.

'The'p'ar'ts thusfar' described are common in grinders for'the production of wood pulp and are so well understood in the art that furtlier. and detailed "description of their "structure and mode of operation is unnecessary. It has also been thought unnecessary to illustrate the usual and more or less elaborate mechanism associated with the ad mission or control of the fluid used to force the piston 72 radially inwardly toward the grindstone Obviously, any suitable means may be provided for this purpose and many examples of suitable means will be found in the prior art.

The grinder illustrated is characterized in that the stone 9 is of greater width and the wood pocket w of greater length than usual. The pocket to is designed to receive rela' tively long lengths of wood and wood of such length that there is an appreciable and material variation in diameter from end to end thereof. To provide for the forcing of such wood against the grindstone g with a substantially uniform pressure, I provide an improved means of connecting the follower f to the pressure device, or to the piston rod r thereof.

Such improved means consists essentially in pivoting the follower to the rod so that it may swing relatively thereto to conform to the taper of the long lengths of wood, as

flanges '10 thereon,- between which is-receiveda member-11 suitably fixed on the lowerend a of rod 9, and the member and flanges are connected by a pivot pin 12. Preferably, the swinging movement of the follower f, as

thuslprovided for,is limited in each 'direc" tlon by abutments 13, provided on the men1,,.

ber 11 and arranged one on each side of the pivot pin .12. Such abutments, function ,by engagement with the upper .face of .the fol-. lower to arrest the. .latter after it has traversed. a predetermined arc, of swinging movement. The degree of swinging -moye ment will, of course, vary according to the particular characterof ,the wood usedfin box w, particularly its length, but, for any given character of work, the desired limits. can be predetermined and ,the abutmentso l3 so disposed with relation to the follower asto insure the proper limiting ofitsswinging, movement.

In operation, fluid is. admitted to cylin ders 0 above thepistonsp, whereuponthey move radially inwardtoward the rotating stone g. Afterthe follower f hasfirstpngaged the wood in box w, it .is tilted on, con tinued movement until itengages the entire length of thewood zv, whereby the pressure will be uniformly distributed upon thewood throughout the length of box w.

The invention has been disclosed herein,- in an embodiment atpresent preferred, for illustrative purposes but the scope ,of, the invention is defined by the appended claims, rather than by the foregoing description.

lL Ina Wood pulp grinder-,a rotary grindstone, a pocket to hold the wood to be ground,a follower to force the wood against the stone, an actuating means for the follower,-a hinge connection between the follower and actuating means restricting the former to swinging movement in a single plane and to and fromrthe stone, and stops to limit'theswinging movementof thefollower in each direction.

2. In a wood .pulp, grinder, a rotary grindsto ne,..a pocket, to, hold the wood to be groun,d, a pressurecylinder, a piston and piston ,rod therefor, a follower to force the wood against thestone, means connecting thefollower to the rod for swinging movement to and from the stone, and means independent of saidconnecting means to limit the swinging vmovement of the follower.

3. In a wood pulp grinder, a rotary grindstone,, a pocket to hold the wood to, be ground, ,a ,pressurecylinder,= a piston and piston-modtherefor arranged. to force the wood. against vthe .stone a follower through which the pressure is transmitted from the.

rod to the wood, said, follower being pivoted to the rod -for swinging movement to and from; the grindstone, and abutments carried by theirod and disposed on opposite sides of. the pivot to limit the swinging movement .of the follower.

HERBERT J. FRINK.

Copies 0! this patent may .be,v obtained for five. cents each byeddres si ng the f.Commissipner of .latents,

Washington, D. 03" I 

